A Perth court has heard a grandfather’s desperate attempts to protect himself from his schizophrenic grandson via a restraining order were in vain, as the 22-year-old was sentenced on Friday for “senselessly” stabbing the man to death outside his Warnbro house two years ago.

Ky Drew Smith-Marciniak was sentenced in the Supreme Court of WA to a minimum of 19 years in jail for killing 79-year-old Victor Marciniak.

The case was heard in the Supreme Court of WA. Credit: Erin Jonasson

The court was told Smith-Marciniak had separately stabbed his father in the chest at 16 years old, and had a “propensity for violence against immediate family” as well as a “fascination of knives”.

Following his arrest as a teenager over the stabbing of his father, Smith-Marciniak was diagnosed with schizo

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